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## org.springframework.orm.toplink
Class UnitOfWorkCallback

    java.lang.Object
      org.springframework.orm.toplink.UnitOfWorkCallback

All Implemented Interfaces:
  TopLinkCallback

    public abstract class UnitOfWorkCallback

extends Object
implements TopLinkCallback

Convenient abstract implementation of the TopLinkCallback interface, exposing a UnitOfWork to perform write operations on.

The exposed UnitOfWork will either be be the active UnitOfWork of the current transaction, if any, or a temporarily acquired UnitOfWork that will be committed at the end of the operation.

Since:
  1.2
Author:
  Juergen Hoeller
See Also:
  `doInUnitOfWork(oracle.toplink.sessions.UnitOfWork)`, `Session.getActiveUnitOfWork()`

Constructor Summary
`UnitOfWorkCallback()`

Method Summary
`Object` | `doInTopLink(oracle.toplink.sessions.Session session)` Determines the UnitOfWork to work on (either the active UnitOfWork or a temporarily acquired UnitOfWork) and delegates to `doInUnitOfWork`.
`protected abstract Object` | `doInUnitOfWork(oracle.toplink.sessions.UnitOfWork unitOfWork)` Called with a UnitOfWork to work on, either the active UnitOfWork or a temporarily acquired UnitOfWork (as determined by the transaction status).

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### UnitOfWorkCallback

    public UnitOfWorkCallback()

Method Detail

### doInTopLink

    public final Object doInTopLink(oracle.toplink.sessions.Session session)
                             throws oracle.toplink.exceptions.TopLinkException

  Determines the UnitOfWork to work on (either the active UnitOfWork or a temporarily acquired UnitOfWork) and delegates to `doInUnitOfWork`.

  Specified by:
    `doInTopLink` in interface `TopLinkCallback`
  Parameters:
    `session` - active TopLink Session
  Returns:
    a result object, or `null` if none
  Throws:
    `oracle.toplink.exceptions.TopLinkException` - if thrown by the TopLink API
  See Also:
    `doInUnitOfWork(oracle.toplink.sessions.UnitOfWork)`

### doInUnitOfWork

    protected abstract Object doInUnitOfWork(oracle.toplink.sessions.UnitOfWork unitOfWork)
                                      throws oracle.toplink.exceptions.TopLinkException

  Called with a UnitOfWork to work on, either the active UnitOfWork or a temporarily acquired UnitOfWork (as determined by the transaction status).

  Parameters:
    `unitOfWork` - the TopLink UnitOfWork to perform write operations on
  Returns:
    a result object, or `null` if none
  Throws:
    `oracle.toplink.exceptions.TopLinkException` - in case of TopLink errors

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